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        自定义MVC框架之四ActionMapping定义
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        <time class="time" datetime="2020-01-18T14:50:37.000Z">
        2020-01-18
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      <p>数据（Action配置文件）有了，对应的数据存储类（ActionMapping）也有了。毫无疑问，接下来就是数据的解析了。使用<code>dom4j</code>解析<code>xml</code>文件。</p>
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class="keyword">import</span> java.io.InputStream;</span><br><span class="line"><span class="keyword">import</span> java.util.HashMap;</span><br><span class="line"><span class="keyword">import</span> java.util.Iterator;</span><br><span class="line"><span class="keyword">import</span> java.util.Map;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> org.apache.commons.lang3.StringUtils;</span><br><span class="line"><span class="keyword">import</span> org.dom4j.Document;</span><br><span class="line"><span class="keyword">import</span> org.dom4j.DocumentException;</span><br><span class="line"><span class="keyword">import</span> org.dom4j.Element;</span><br><span class="line"><span class="keyword">import</span> org.dom4j.io.SAXReader;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 读取action的配置文件，并转换成ActionMapping对象</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">ActionMappingManager</span> </span>&#123;</span><br><span class="line">    </span><br><span class="line">    <span class="comment">// 参数一保存每个action标签的name属性值，参数二保存转换后的action标签对象</span></span><br><span class="line">    Map&lt;String, ActionMapping&gt; actionMappings = <span class="keyword">new</span> HashMap&lt;String, ActionMapping&gt;();</span><br><span class="line">    </span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="title">ActionMappingManager</span><span class="params">()</span> </span>&#123;    &#125;</span><br><span class="line">    <span class="comment">// 读取配置文件并解析</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="title">ActionMappingManager</span><span class="params">(String[] configFiles)</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">        <span class="comment">//  校验入参</span></span><br><span class="line">        <span class="keyword">if</span> (<span class="keyword">null</span> == configFiles || configFiles.length &lt;= <span class="number">0</span>) &#123;</span><br><span class="line">            <span class="keyword">throw</span> <span class="keyword">new</span> Exception(<span class="string">&quot;请指定action的配置文件！&quot;</span>);</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="comment">// 遍历action配置文件，并解析初始化到actionMappings中</span></span><br><span class="line">        <span class="keyword">for</span> (String cfgFile : configFiles) &#123;</span><br><span class="line">            readCfg(cfgFile);</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">    </span><br><span class="line">    <span class="comment">/**</span></span><br><span class="line"><span class="comment">     * 根据action类名获取action配置</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@param</span> actionName 名称</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@return</span> ActionMapping</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@throws</span> Exception </span></span><br><span class="line"><span class="comment">     */</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> ActionMapping <span class="title">getActionMapping</span><span class="params">(String actionName)</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">        <span class="keyword">if</span> (StringUtils.isBlank(actionName)) &#123;</span><br><span class="line">            <span class="keyword">throw</span> <span class="keyword">new</span> Exception(<span class="string">&quot;入参actionName不允许为空！&quot;</span>);</span><br><span class="line">        &#125;</span><br><span class="line">        ActionMapping am = <span class="keyword">this</span>.actionMappings.get(actionName);</span><br><span class="line">        <span class="keyword">if</span> (<span class="keyword">null</span> == am) &#123;</span><br><span class="line">            <span class="keyword">throw</span> <span class="keyword">new</span> Exception(<span class="string">&quot;没有Action[&quot;</span>+actionName+<span class="string">&quot;]的配置！&quot;</span>);</span><br><span class="line">        &#125;</span><br><span class="line">        </span><br><span class="line">        <span class="keyword">return</span> am;</span><br><span class="line">    &#125;</span><br><span class="line">    </span><br><span class="line">    <span class="comment">/**</span></span><br><span class="line"><span class="comment">     * 读取action配置，并设置到ActionMapping map中</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@param</span> cfgFile action配置</span></span><br><span class="line"><span class="comment">     */</span></span><br><span class="line">    <span class="meta">@SuppressWarnings(&quot;rawtypes&quot;)</span></span><br><span class="line">    <span class="function"><span class="keyword">private</span> <span class="keyword">void</span> <span class="title">readCfg</span><span class="params">(String cfgFile)</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">        <span class="keyword">try</span> &#123;</span><br><span class="line">            <span class="comment">//  解析action配置</span></span><br><span class="line"><span class="comment">//            InputStream is = this.getClass().getResourceAsStream(cfgFile);</span></span><br><span class="line">            InputStream is = Thread.currentThread().getContextClassLoader().getResourceAsStream(cfgFile);</span><br><span class="line">             <span class="comment">// 创建saxReader对象  </span></span><br><span class="line">            SAXReader reader = <span class="keyword">new</span> SAXReader();  </span><br><span class="line">            <span class="comment">// 通过read方法读取一个文件 转换成Document对象  </span></span><br><span class="line">            Document doc = reader.read(is);   <span class="comment">//new File(&quot;src/dom4j/sida.xml&quot;)</span></span><br><span class="line">            <span class="comment">//获取根节点元素对象  </span></span><br><span class="line">            Element actions = doc.getRootElement();</span><br><span class="line">            <span class="comment">//  遍历每个action标签</span></span><br><span class="line">            Iterator it = actions.elementIterator();</span><br><span class="line">            <span class="keyword">while</span> (it.hasNext()) &#123;</span><br><span class="line">                <span class="comment">//  action转换为ActionMapping</span></span><br><span class="line">                ActionMapping am = <span class="keyword">new</span> ActionMapping();</span><br><span class="line">                Element action = (Element) it.next();</span><br><span class="line">                <span class="comment">// 获取action标签的属性name和class</span></span><br><span class="line">                String actionName = action.attributeValue(<span class="string">&quot;name&quot;</span>);</span><br><span class="line">                String actionClassName = action.attributeValue(<span class="string">&quot;class&quot;</span>);</span><br><span class="line">                </span><br><span class="line">                am.setActionName(actionName);</span><br><span class="line">                am.setActionClassName(actionClassName);</span><br><span class="line">                </span><br><span class="line">                <span class="comment">// 遍历action下的result标签</span></span><br><span class="line">                Iterator results = action.elementIterator();</span><br><span class="line">                <span class="keyword">while</span> (results.hasNext()) &#123;</span><br><span class="line">                    Element result = (Element) results.next();</span><br><span class="line">                    <span class="comment">// 获取result标签的属性name和内容</span></span><br><span class="line">                    String resultName = result.attributeValue(<span class="string">&quot;name&quot;</span>);</span><br><span class="line">                    String redirect = result.attributeValue(<span class="string">&quot;redirect&quot;</span>);</span><br><span class="line">                    String resultContent = result.getTextTrim();</span><br><span class="line">                    <span class="keyword">if</span> (StringUtils.isBlank(resultContent))</span><br><span class="line">                        resultContent = <span class="string">&quot;input&quot;</span>;</span><br><span class="line">                    </span><br><span class="line">                    <span class="comment">//  保存result标签值</span></span><br><span class="line">                    Map&lt;String, String&gt; rs = <span class="keyword">new</span> HashMap&lt;String, String&gt;();</span><br><span class="line">                    rs.put(<span class="string">&quot;RESULT_CONTENT&quot;</span>, resultContent);</span><br><span class="line">                    rs.put(<span class="string">&quot;REDIRECT&quot;</span>, redirect);</span><br><span class="line">                    am.setResultMap(resultName, rs);</span><br><span class="line">                &#125;</span><br><span class="line">                </span><br><span class="line">                actionMappings.put(am.getActionName(), am);</span><br><span class="line">            &#125;</span><br><span class="line"></span><br><span class="line">        &#125; <span class="keyword">catch</span> (DocumentException e) &#123;</span><br><span class="line">            e.printStackTrace();</span><br><span class="line">        &#125;</span><br><span class="line">        </span><br><span class="line">    &#125;</span><br><span class="line">    </span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>&#123;</span><br><span class="line">            </span><br><span class="line">        String cfgFile = <span class="string">&quot;E:\\html2pdf_codes\\snails\\src\\com\\snails\\framework\\config\\snails-actions.xml&quot;</span>;</span><br><span class="line">        <span class="keyword">new</span> ActionMappingManager().readCfg(cfgFile);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>方法中的参数异常直接抛到上一层处理。代码也没什么难度，注意解析过程获取节点数据的关键字与xml文件对应即可。<br>如果你对xml文件的解析不是很明白请参考<a target="_blank" rel="noopener" href="https://www.baidu.com/s?wd=dom4j%E8%A7%A3%E6%9E%90xml&rsv_spt=1&rsv_iqid=0xd4cdb0e5000a615d&issp=1&f=3&rsv_bp=1&rsv_idx=2&ie=utf-8&tn=baiduhome_pg&rsv_enter=0&oq=dom4j%E8%A7%A3%E6%9E%90xml&rsv_t=44e2UcI2nb1JG2MNxwVoCiJAnp7EY8mCUw8hbK5d9n4q6EYLtB5t/ooTycDqlaIQW4pq&rsv_sug3=8&rsv_sug1=6&rsv_sug7=100&rsv_pq=8bd2fa580008e6b8&rsv_sug4=458">xml解析教程</a>。其他不多说，请继续看后面的文章。</p>
<p>项目完整代码请看<a target="_blank" rel="noopener" href="https://github.com/ubuntuvim/myMVC">MyMVC</a>，欢迎fork学习，如果你觉得对你有帮助给我点个赞吧，当然也欢迎给我提意见（email:<a href="mailto:&#x31;&#x35;&#x32;&#55;&#50;&#53;&#x34;&#48;&#50;&#55;&#x40;&#113;&#113;&#46;&#99;&#111;&#x6d;">&#x31;&#x35;&#x32;&#55;&#50;&#53;&#x34;&#48;&#50;&#55;&#x40;&#113;&#113;&#46;&#99;&#111;&#x6d;</a>，chendequanroob@gmail.com）。</p>

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          document.body.removeChild(hearts[i].el);
          hearts.splice(i, 1);
          continue;
        }
        hearts[i].y--;
        hearts[i].scale += 0.004;
        hearts[i].alpha -= 0.013;
        hearts[i].el.style.cssText = "left:" + hearts[i].x + "px;top:" + hearts[i].y + "px;opacity:" + hearts[i].alpha + ";transform:scale(" + hearts[i].scale + "," + hearts[i].scale + ") rotate(45deg);background:" + hearts[i].color;
      }
      requestAnimationFrame(gameloop);
    }

    /**
     * 给logo设置点击事件
     * 
     * - 回到顶部
     * - 出现爱心
     */
    function attachEvent() {
      var old = typeof window.onclick === "function" && window.onclick;
      var logo = document.getElementById("logo");
      if (logo) {
        logo.onclick = function(event) {
          returnTop();
          old && old();
          createHeart(event);
        }
      }
      
    }

    function createHeart(event) {
      var d = document.createElement("div");
      d.className = "heart";
      hearts.push({
        el: d,
        x: event.clientX - 5,
        y: event.clientY - 5,
        scale: 1,
        alpha: 1,
        color: randomColor()
      });
      document.body.appendChild(d);
    }

    function css(css) {
      var style = document.createElement("style");
      style.type = "text/css";
      try {
        style.appendChild(document.createTextNode(css));
      } catch (ex) {
        style.styleSheet.cssText = css;
      }
      document.getElementsByTagName('head')[0].appendChild(style);
    }

    function randomColor() {
      // return "rgb(" + (~~(Math.random() * 255)) + "," + (~~(Math.random() * 255)) + "," + (~~(Math.random() * 255)) + ")";
      return "#F44336";
    }

    function addMenuEvent() {
      var menu = document.getElementById('menu-main-post');
      if (menu) {
        var toc = document.getElementById('toc');
        if (toc) {
          menu.onclick = function() {
            if (toc) {
              if (toc.style.display == 'block') {
                toc.style.display = 'none';
              } else {
                toc.style.display = 'block';
              }
            }
          };
        } else {
          menu.style.display = 'none';
        }
      }
    }

  })(window, document);
</script>

  



</body>
</html>
